Transformation of cyclohexene to enantiopure cyclitols mediated by sequential oxyselenenylation with (S,S)-hydrobenzoin: synthesis of d-chiro-inositol and muco-quercitol
Conversion of racemic allylic hydroperoxides into corresponding chiral 1/2,3-triols by using catalytic OsO$_{4}$ and chiral cinchona ligands in the absence of co-oxidant
作者:Haydar GÖKSU、Mehmet Serdar GÜLTEKİN
DOI:10.3906/kim-1411-68
日期:——
For the first time, removal of oxygen atoms from allylic hydroperoxide functionality and reintroduction to the double bond was achieved using catalytic OsO$_4}$ and chiral cinchona alkaloid derivatives in an acetone-water mixture to give corresponding chiral 1/2,3-triol with an enantioselectivity up to 99% ee. The hydroperoxide group was used as both a co-oxidant and a source of hydroxyl groups. This protocol is thought to have potential to provide opportunities for chiral synthesis of 1/2,3-triols from corresponding allylic hydroperoxides in the absence of co-oxidant in one stage for the first time in the literature.
Substrate-Triggered Stereoselective Preparation of Highly Substituted Organic Carbonates
作者:Victor Laserna、Eddy Martin、Eduardo C. Escudero-Adán、Arjan W. Kleij
DOI:10.1021/acscatal.7b01748
日期:2017.8.4
stereochemistry of the organiccarbonates combined with various control experiments revealed that these compounds are formed through a mechanistic manifold that involves a depolymerization reaction within an oligomeric carbonate induced by a pendant hydroxyl nucleophile. This manifold therefore provides an alternative approach toward CO2 valorization into functional cyclic carbonate scaffolds of use in
Synthesis of enantiopure cyclitols from (±)-3-bromocyclohexene mediated by intramolecular oxyselenenylation employing (S,S)-hydrobenzoin and (S)-mandelic acid as chiral sources
作者:Yong Joo Lee、Kyunghoon Lee、Sea Ill Jung、Heung Bae Jeon、Kwan Soo Kim
DOI:10.1016/j.tet.2005.01.003
日期:2005.2
Reaction of 3-bromocyclohexene with (SS)-hydrobenzoin and (S)-mandelic acid and subsequent intramolecular oxyselenenylation of the resulting allylic ethers followed by oxidation-elimination afforded the valuable cis-fused bicyclic olefins, (1S,3S,4S,6R)-3,4-diphenylbicyclo[4,4,0]-2,5-dioxa-7-decene and (1S,3S,4R)-3-phenyl-4a,7,8,8a-tetrahydro-benzo[1,4]dioxan-2-one, respectively. Further stereoselective transformation of these cis-fused bicyclic olefins afforded the enantiopure cyclohexitols, muco-quercitol, D-chiro-inocitol and allo-inocitol. (C) 2005 Elsevier Ltd. All rights reserved.